Finding indices with a certain property

"GB" == Goran Brostrom <gb at stat.umu.se> writes:

GB> I want the indices i for which x[i] < 0 (say):

    >> x <- c(1, -1, 3, 3, -2) where.negative(x)
    GB> [1] 2 5

    GB> Surely where.negative is something simple, but how?

Yes :

which(x < 0)
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